Chevrolet Low Cab Forward 4500 2019 Series Owner's Manual page 146

Symptom
Engine does not Starter does not
start turn over, or weak
Engine does not
Starter turns over
start
Cause
Discharged batteries
Battery terminals
detached, loose,
or corroded
Starter ground wire
terminal detached,
loose, or corroded
Engine oil viscosity
too high
Starter or electrical
system is faulty
No fuel
Fuel pump clogged
Pressure regulator is
faulty
Ignition system is faulty
Engine control (electrical
system) is faulty
Driving and Operating
Corrective Action
Recharge or replace
After repairing corroded
section, connect the
terminals firmly
After repairing corroded
section, connect the
terminals firmly
Change to an oil with
proper viscosity
Make sure there are no
fuel leaks, and then
add fuel
145
Reference
See Battery - North
America 0 212
-
-
See Engine Oil
0 192
-
-
-
-
-
-